JP2003239265A - Automatic water stop device for irrigation - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an automatic water stop device for irrigation, which is handleable, small-sized as a whole and superior in operation stability. <P>SOLUTION: In a body 3 provided with an intake 8, an outlet 9, a valve seat 11 therebetween and a valve disc 12 for opening and closing the valve seat 11, a valve rod slid through the valve disc 12 is mounted in a sideward posture with free displacement, and a shaft 21 is rotatably mounted in parallel to the valve rod 15 and around an axial line. The valve 15 is biased by a spring 19 in the valve closing direction, and, when the valve rod 15 is at a valve opening position, a hook 22 locked on the valve rod 15 is mounted on the shaft 21. A float 24,is mounted, the shaft 21 is rotated by the float 24 ascending together with a water level of a rice paddy, and the hook 22 is removed from the valve rod 15 to displace the valve rod 15 at a valve closing position. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic water shutoff device used to automatically shut off irrigation water supplied from paddy fields to paddy fields.

[0002]

2. Description of the Related Art Conventionally, as a method of supplying general irrigation water to a paddy field, a method of installing an irrigation channel outside the paddy field and taking water from the irrigation channel through a sluice gate, an intake pipe, etc. There is a method of installing a flowing tubular canal, installing an intake valve at a required position of this canal, and taking water through this intake valve. If too much water is supplied here, this water will overflow from the paddy fields and the fertilizer, chemicals, etc. will also flow out and be wasted.Therefore, when the necessary amount of water has been supplied, close the intake valve, lock the water gate, or remove water. It is necessary to close the water pipe. However, in order to do so, it was necessary to visit the paddy fields many times to check the amount of water, and management was extremely troublesome.

On the other hand, in order to solve such a problem, for example, Japanese Unexamined Patent Publication No. 10-195856 discloses an automatic water stop device capable of automatically stopping the water supplied to a paddy field or the like. . This water stop device has a ball-shaped valve body that opens and closes a valve seat in a housing, a valve rod that is connected to the valve body and extends upward from the housing, and locks the valve rod in a valve open position. It has a displaceable stopper, a spring that springs the valve rod in the valve closing direction, a float that is displaced by the water level of the paddy field, and a flexible wire that transmits the displacement of this float to the stopper. When the float rises due to the rise of the water level, the stopper is pulled by the wire and disengages from the valve rod, and the resilient force of the spring causes the valve body to close the valve seat.

However, in the above-mentioned conventional water stop device, since the valve rod largely protrudes right above the housing, the protruding portion interferes with the work, and it may malfunction due to contact with farm tools, human bodies, etc. There is a problem that it is easy to do. Further, the float is supported by a supporting tool separate from the main body of the water stop, and is installed at a position apart from the water stop main body.
Since the displacement of this float is transmitted to the stopper through the above wire inserted in the tube, the entire device becomes extremely large and poorly organized, not only is it difficult to handle, but also the sliding of the wire in the tube. In some cases, the displacement of the float is not transmitted to the stopper due to the dynamic resistance, and there is also a drawback that the accuracy of the operation is poor.

[0005]

SUMMARY OF THE INVENTION The technical problem of the present invention is to provide an irrigation automatic water shut-off device which is small in size as a whole and easy to handle, and has excellent operation stability.

[0006]

In order to solve the above-mentioned problems, according to the present invention, a water intake communicating with an irrigation canal, and a water discharge for introducing the water flowing from the water intake into a paddy field are provided. A body having a valve seat laterally provided in a flow path connecting the water intake port and the water discharge port, a valve body for opening and closing the valve seat, and an axis lined horizontally on the body and movably installed in the axial direction. , A valve rod having the valve element connected to the tip, a spring for urging the valve rod in the valve closing direction, and the valve rod,
An engaging portion formed so that the hook can be engaged at the valve opening position, a shaft supported by the body so as to be rotatable around its own axis, and attached to the shaft,
The hook that engages and disengages with the locking portion of the valve rod by the rotation of the shaft is attached to the end portion of the shaft in a direction orthogonal to the shaft, and the shaft is displaced by the rise of the water level in the paddy field. An automatic water shutoff device for irrigation is provided, which has a float that rotates around.

In the automatic water shut-off device of the present invention having the above-mentioned structure, the valve element is held in the open state by engaging the hook with the engaging portion in the state where the valve rod is moved to the valve opening position. Water flows into the paddy fields from the irrigation canal. At this time, the spring is compressed by the retreat of the valve rod. When the water level in the paddy rises, the float rises and the shaft rotates accordingly. When the water level in the paddy reaches a desired level and the float rises to a certain height, the hook disengages from the valve stem due to the rotation of the shaft. Close the seat and stop the water.

According to such an automatic water shut-off device of the present invention, the valve rod is installed laterally on the body, and the valve body is opened and closed laterally by the displacement in the axial direction. Since the operating means for transmitting the displacement to the valve rod to close it is formed by the shaft and the shaft is directly supported by the body, the valve rod is largely projected above the body, The entire device can be made very compact without the inconvenience that the operating means is installed away from the main body of the device, and the handling at the time of transportation and installation becomes easy. Moreover, since the valve rod is configured to be closed by rotating the shaft with the displacement of the float, the displacement of the float is reliably transmitted to the valve rod as compared with the conventional device that uses a wire having a large sliding resistance. The operation is accurate and stable.

According to a specific configuration of the present invention, the shaft and the valve rod are arranged in parallel at positions close to each other, and a float support arm is attached to a rear end portion of the shaft at a right angle. The float is connected to the tip of the float support arm.

In the present invention, preferably, the body is constructed so as to be attachable to a water intake valve provided in the water channel or connectable to a water intake pipe branched from the water channel.

[0011]

1 to 3 show a first embodiment of an automatic water shut-off device for irrigation according to the present invention. This automatic water shut-off device 1A is provided with a water supply pressurized by a pump. It is used by being attached to an existing water intake valve 2 provided in a flowing tubular water channel.

The automatic water shutoff device 1A has a body 3 to be attached to the water intake valve 2. The body 3 is composed of a first body portion 3a and a second body portion 3b which are connected to each other. The cap body-shaped first body portion 3b allows the intake valve 2 to have a cock 4 for opening and closing. The seal member 5 is exposed to the outside.
It is attached so as to surround the liquid supply port 6 in a liquid-tight manner via. The body 3 is provided with a water intake 8 leading to the water supply port 6 of the water intake valve 2, a downward water discharge port 9 for allowing the water flowing from the water intake 8 to flow into the paddy field, and these water intakes. 8 has a valve seat 11 formed in a lateral direction in a flow path 10 connecting the water discharge port 8 and the water discharge port 9, and a poppet-type valve body 12 that opens and closes the valve seat 11 at a position on the upstream side of the valve seat 11. Is provided.

The support portion 1 located at the side end portion of the body 3
3, a valve rod 15 is attached so that its axis is laterally movable so as to be movable in the axial direction. The base end of the valve rod 15 penetrates the central portion of the valve seat 11 and The valve element 12 is attached to the base end of the valve element 12 by projecting to the upstream side. Further, the tip of the valve rod 15 projects outward from the end face of the body 3, the spring seat 17 and the reset operation knob 18 are attached to the tip, and the spring seat 17 and the end face of the body 3 are connected to each other. A spring 19 is contracted between them, and the spring 19 constantly urges the valve rod 15 in the valve closing direction. In the middle part of this valve rod 15,
A locking portion 20 formed of a groove is provided in a portion of the body 3 that faces the flow path 10.

A shaft 21 is provided on the support portion 13 of the body 3 at a position adjacent to the valve rod 15 so that the shaft 21 is provided with the shaft 21.
It is mounted so as to be parallel to 5 and rotatable about its own axis. The base end of the shaft 21 projects into the flow path 10 inside the body 3, and the hook 22 that can be fitted and locked to the locking portion 20 of the valve rod 15 is fixed to the base end. Further, the tip of the shaft 21 projects to the outside of the body 3, a float support arm 23 is attached to this tip in the orthogonal direction, and a float 24 is attached to the tip of the support arm 23. In the figure, 25 is a tubular protective wall surrounding the intake valve 2.

In the automatic water shutoff device having the above structure,
When supplying irrigation water to paddy fields, as shown in Fig. 2,
The valve rod 15 is pushed into the body 3 against the elastic force of the spring 19, and the hook 20 at the tip of the shaft 21 is attached to the locking portion 20.
After holding the valve rod 15 at the position where the valve body 12 is opened, the cock 4 of the water intake valve 2 is opened. As a result, the water flowing out from the liquid supply port 6
The water flows from the water intake 8 of the body 3 through the valve seat 11 that opens to the water discharge port 9, and then flows into the paddy field. At this time, the spring 19 at the tip of the valve rod 15 is compressed, and its elastic force urges the valve rod 15 toward the valve closing direction (forward direction).

When the water level in the paddy rises, the float 24
Rises, and the shaft 21 rotates accordingly. When the inside of the paddy reaches the desired water level and the float 24 rises to a certain height, the shaft 22 rotates by a predetermined angle to disengage the hook 22 from the valve rod 15, so that the valve rod 15 springs the spring 19. The valve body 12 closes the valve seat 11 to stop water by moving forward by the force of generation.

In such an automatic water shutoff device 1A, the valve rod 15 is installed laterally on the body 3, and the valve body 12 is opened and closed laterally by the displacement in the axial direction thereof. Since the shaft 21 forms the operating means for transmitting the displacement to the valve rod 15 and closing it, the shaft 21 is directly supported by the body 3, so that the valve rod 15 is largely projected above the body 3. Alternatively, it is possible to make the entire apparatus very compact without any inconvenience that the above-mentioned operation means is installed away from the main body of the apparatus, and it becomes easy to handle during transportation and installation. Moreover, since the valve rod 15 for rotating the shaft 21 is configured to be closed by the displacement of the float 24, the float 24 is different from the conventional device using a wire having a large sliding resistance.
The displacement can be reliably transmitted to the valve rod 15, and the water stopping operation can be performed accurately and stably.

In the illustrated embodiment, the locking portion 20 of the valve rod 15 is used.
Although it is formed in the intermediate portion located inside the body 3, it may be formed in the tip portion protruding to the outside of the body 3, and thus the locking portion 20 is formed in the tip portion of the valve rod 15 in this way. By forming it, it is possible to easily and surely perform the work of locking the hook 22 while visually confirming the work. In this case, it goes without saying that the hook 22 is also provided at the end of the shaft 21 protruding from the body 3. Further, the locking portion 20 is not limited to the groove, but may be formed by a flange-shaped or pin-shaped projection.

FIGS. 4 to 6 show a second embodiment of the present invention. The automatic water shutoff device 1B of the second embodiment has a water channel 30.
It is connectable to the intake pipe 31 branched from.
That is, the body 33 of the automatic water shut-off device 1B is connected to the first body portion 33a of a tubular shape for connecting coaxially to the tip of the water intake pipe 31 and the first body portion 33a via the connecting member 33c. Tubular second body portion 33b
The valve seat 11 is formed at one end of the second body portion 33b, and the valve body 12 for opening and closing the valve seat 11 is housed inside the first body portion 33a. A support portion 13 is provided at the other end of the second body portion 33b, and the valve rod 15 and the shaft 21 are attached to the support portion 13 in the same manner as in the first embodiment. A height adjustable column 32 is attached to the body 33, and the weight of the column 32 is supported by the column 32.

The other structure, operation and preferable modified example of the second embodiment are substantially the same as those of the first embodiment. The description thereof will be omitted.

[0021]

As described above, according to the present invention, it is possible to obtain an automatic irrigation water shutoff device which is small in size as a whole and is easy to handle and has excellent operation stability.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of an automatic water shutoff device for rinsing according to the present invention.

FIG. 2 is a cross-sectional view of FIG.

FIG. 3 is a side view of FIG.

FIG. 4 is a perspective view showing a second embodiment of the automatic water stop apparatus for irrigation according to the present invention.

5 is a cross-sectional view of FIG.

FIG. 6 is a side view of FIG.

[Explanation of symbols]

1A, 1B automatic water stop device 2 Water intake valve 3,33 body 3a, 33a First body part 3b, 33b second body part 8 water intake 9 water outlet 10 channels 11 seat 12 valve bodies 13 Support 15 valve rod 17 Spring seat 18 knobs 19 springs 20 Locking part 21 shaft 22 hook 23 arms 24 floats 25 protective wall 30 canals 31 Intake pipe 32 props 33c connecting member

Claims (4)

[Claims] 1. A water intake connected to an irrigation canal, a water discharge outlet for allowing water flowing from the water intake to flow into a paddy field, and a lateral passage provided between the water intake and the water discharge outlet. A valve body that has a valve seat, a valve body that opens and closes the valve seat, a valve rod that is installed on the body such that the axis of the body is horizontal and is movable in the axial direction, and the valve body is connected to the tip of the body, A spring for urging the valve in the valve closing direction, a locking portion formed on the valve rod so that the hook can be locked at the valve opening position, and supported by the body so as to be rotatable about its own axis. A shaft attached to the shaft, and the hook that engages and disengages with the locking portion of the valve rod by rotation of the shaft; Displaced by the shaft Float to rotate about the axis, the automatic water stop device for 濯概 characterized in that it comprises a. 2. The shaft and the valve rod are arranged in parallel at positions close to each other, and a float support arm is attached to a rear end portion of the shaft in a direction perpendicular to the float support arm. 2. The automatic water shutoff device according to claim 1, wherein 3. The automatic water shutoff device according to claim 1, wherein the body is attachable to a water intake valve provided in a water channel. 4. The automatic water shutoff device according to claim 1 or 2, wherein the body is connectable to an intake pipe branched from an irrigation canal.